“What is it that breathes fire into the equations and makes a universe for them to describe?” Stephen Hawking wondered, recognizing the quixotic nature of his quest for a theory of everything — a complete and final explanation of the universe, a universe only rendered real in the mind.

Around the same time, on another landmass, watching finches cling to the swaying branches in the wind, a scientist as original and unrelenting in his own quest was wondering about the “internal fires that fuel these wisps of feather and bone,” recognizing that each mind is itself a universe, that inside every skull, even the smallest, is a place black and fathomless as pure spacetime, housing an umwelt of which an outside observer can only ever have an incomplete theory.

Considered by many the most effective conservationist of the past century, George Schaller — the first researcher to walk among wild gorillas unarmed and be rewarded with unprecedented insight into their universe, the first to take a photograph of the elusive snow leopard, rigorous and sensitive biographer of the lives of species as varied as the African lion and the Tibetan antelope, and now himself the subject of Miriam Horn’s rigorous and sensitive biography Homesick for a World Unknown (public library) — has spent the better portion of his days in wild places where “one settles at times for mere survival,” bitten and blistered and burnt, often haunted by his sense of “terrible loneliness” and “utter insignificance,” yet determined to prevail over parasites and bureaucrats and armed rebels to bring us a little bit closer to the abiding mystery of that unreachable otherness dwelling inside every consciousness, every sensorium, every animal body nerved with the history of its habitat and its habits.
Out of his life arises the unnerving, redemptive intimation that all the whys of our theology and philosophy are dwarfed by a single how honed to the point of revelation on the whetstone of observation and interpretation we call science; that the most interesting question about life is not why it exists but how it coheres, how it sings, what it is like to be alive — a question only ever answerable through what Horn calls “sustained intimacy” with the other via our own animal bodies, only answered with a “willingness to confess bafflement.”

Of all the baffling creatures whose universes Schaller entered with his torch of thought and tenderness, none was a greater mystery than the giant panda — doubly so for having be so rampantly Disneyfied and Instagrammed into a stuffed toy for the modern mind, shorn of its creaturely reality, all the more unknown for being so voyeuristically objectified.

Born uncommonly vulnerable — a pink handful of hairless flesh one nine-hundredth of the weight they would grow to, entirely dependent on the mom that must carry the infant in her mouth or paw continuously until it has grown to what Schaller described as a “panda-colored beanbag with legs” — pandas, even in their full-grown gigantism, remain one of our planet’s most vulnerable creatures, dealt a cruel hand by evolution, displaced and enslaved in our own hands. Schaller saw that what was needed was not merely better science but a restitution of these creatures’ dignity by meeting them, with curiosity and empathy, on their own terms — not as a symbol, not as a plaything, but as a living mystery with a sensorium and umwelt all its own.

Contextualizing the alien world he entered when he began his work with the giant panda, Horn writes:

A wild panda… doesn’t announce its presence like gorillas with big, noisy families, nor does it roam like a tiger. Instead, it stays mostly alone and mostly still, inside a world that seems designed to hide it: of bamboo screens all around made still more opaque by near-constant mists and rains. There it sits, just quietly eating, day and night. It must, because in one of the clumsier turns of evolution, it has become wholly dependent on a food it can barely digest. Though the purest of herbivores, eating only bamboo, a panda still has its carnivorous ancestors’ gut. Lacking the internal fermentation vat and symbiotic microbes that enable cows, giraffes, and other grass and leaf eaters to access the nutrients in cellulose and lignin, a panda can assimilate just 17 percent of the bamboo it eats. It can’t build enough fat to hibernate or even to sleep all night, but can survive only (like the orbiting humans in WALL-E) by combining gluttony with sloth.

Horn observes that the qualities we find most endearing in pandas — those traits most emblematic of their commodified cuteness — are an evolutionary consequence of this metabolic dictum:

Their sweet, broad head provides a strong anchor for jaws powerful enough to snap, strip, crush, and grind woody stalks. Their roly-poly body serves as a big, bamboo-holding barrel: George calculated that his favorite panda ate on average eighty-five pounds a day, half her body weight. Their famous pseudothumb, an elongated wrist bone, allows them to grab and hold even the slenderest stem, and to eat with exceptional efficiency. As George counted, one big male bit into 3,481 stems, rhythmically feeding each into the side of his mouth like a pencil into a sharpener, levering it Bugs Bunny–style into pieces, and reaching for the next before the last was swallowed. Most passes right through: Schaller weighed a single scat pile at seventeen pounds.

Taking in such meager energy, pandas must spend just as little. Most barely budge in a day, traveling no farther than a few hundred meters. Like Roman emperors, they eat slouched or reclined; George watched one lie on his back and use his hindpaws to bend stems toward his mouth, saving both forepaws for shoveling in the leaves. They don’t build beds, their plush bodies serving as both mattress and comforter. More than once, George saw a sated panda abruptly flop over onto its side or belly like a wound-down toy, fall promptly to sleep, then wake like Winnie-the-Pooh: raising arms overhead to yawn, rubbing their back end against a tree, even (when fed) licking a porridgy paw clean. Yet for all that adorableness, they were the most truly solitary animal George had ever known.

But despite how closely and patiently he observed the pandas, Schaller felt the cold edge of their otherness. “Her being eludes me,” he wrote after countless hours observing a particular female he saw as “complete in herself… final and preordained,” finding himself “hopelessly separated by an immense space.” An epoch after Kepler invented science fiction with his imaginative parable about life on other worlds, Schaller turned to that most ancient of storytelling forms to imagine life in other worlds — the inner world of a panda — in a parable serving a moving reminder of just how alien this planet’s life-forms ultimately are to one another. Reaching across the immense space, he channeled the voice of the panda warning about her own unknowability:

You cannot divide me into… fragments of existence… I am, like any other being, infinite in complexity, indivisible. [Even] time is not the same for all living things. This fir lives more slowly than you, and I more quickly… Some of you… hold that language is necessary before one can think, and that makes me and all others — except you — unthinking creatures. What frivolous nonsense!… I think mainly with smells… Forget science now and then.”

Recognizing that we can only ever perceive other creatures the way we perceive one another — in fragmentary glimpses of a remote reality stitched together into a coherent picture by tenuous threads of theory and speculation — Schaller added in the urgent voice of his parable-panda:

Look at each other. Your ways of thinking are vastly different, yet you belong to the same species.

Exposing the weft of science’s warp, he wrote:

What we observe is not nature herself, but nature exposed to our method of questioning.

In a sentiment part Emily Dickinson, part Wittgenstein, part Zen kaon, he captured the central mystery of aliveness:

The panda is the answer. But what is the question?

Complement this fragment of the wholly magnificent Homesick for a World Unknown with a taste, delicious and incomplete, of what it’s like to be an orca, what it’s like to be an owl, and what it’s like to be a falcon.